9731557420 has 72 divisors (see below), whose sum is σ = 22344862176. Its totient is φ = 3558177792.

The previous prime is 9731557399. The next prime is 9731557447. The reversal of 9731557420 is 247551379.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334164 + ... + 362116.

It is an arithmetic number, because the mean of its divisors is an integer number (310345308).

Almost surely, 2^9731557420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9731557420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11172431088).

9731557420 is an abundant number, since it is smaller than the sum of its proper divisors (12613304756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9731557420 is a wasteful number, since it uses less digits than its factorization.

9731557420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28091 (or 28076 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 9731557420 is about 98648.6564530911. The cubic root of 9731557420 is about 2134.9815017767.

The spelling of 9731557420 in words is "nine billion, seven hundred thirty-one million, five hundred fifty-seven thousand, four hundred twenty".